![]() For this example let’s assume the deviation is 1.5. The next step is to determine the standard deviation of the population.For this example, we will assume the mean is 20.Through analyzing the formula above, we know the first step will be to acquire the mean of the population.The following is a step by step guide on how to calculate the z-score: This means that a z-score directly correlates with a confidence interval How to calculate a z-score? Since z-score is used to compare observed data to theoretical data, another way of looking at it is to say that it’s a measure of confidence in a data set. Determining the z-score requires that one knows the mean and standard deviation of a total population that the data in question belongs to. ![]() ![]() A z-score, also known as a standard score, is a term used in statistics to describe a signed fractional number of standard deviations by which the value of a data point is above the mean value.Ī Z-score is used to compare observational data to theoretical deviation.
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